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Pros

Pro

Clean interface

mIRC interface is uncluttered, easy to overview and use. Additionally, it is highly customizable where fonts, layouts, aliases, popups, etc can be changed and extendable so it can be made to fit any necessities.

Pro

Highly scriptable with an ever-evolving scripting language

Scripts are short programs (sets of instructions) that can be used to automate tasks in mIRC. mIRC has its own scripting language which can be used to perform many different types of tasks, from managing IRC channels to playing multi-user online games.

mIRC scripts can also be used to perform tasks that are not IRC-related, such as managing files on the computer, sending emails, or backing up a web server.

The scripting language is being improved upon and developed further with each release of mIRC.

Pro

Free trial

mIRC offers a free 30-day trial.

Pro

Functionality can be extended with a vast array of scripts

A vast array of scripts are available on the web.

Pro

Crackable if you NOP CRC

Very easy to crack if you know basic Reverse Engineering.

Pro

Has been in active development for over 20 years

mIRC was created in 1995 by Khaled Mardam-Bey and is still being actively developed.

Pro

Per-server settings

It's possible to create a list of settings and action that perform when connecting to a specific server. All of these things are easy to set up and use.

Pro

Almost all actions can be performed via buttons

mIRC offers easy to use graphical solutions for a wide range of different IRC commands and server configurations so it's possible to use either commands or icons based on preference.

Cons

Con

Not free

mIRC is not free but only a trial for 30 days, after that the user is asked to pay $20 to be able to use the software.

Con

No command line solution

Con

Vague information on validity of purchased licenses

Developer only says a license is valid for "several years" and is known to have intentionally voided licenses that were specifically described as lifetime licenses for repeat business.